Our Slipstream Di2 wiring upgrade, designed specifically for the newest Shimano Dura Ace 9150 and 9170, and Ultegra 8050 and 8070 components, offers a number of improvements for 2018. We’ve minimized the external run of the wiring. The setup is cleaner, simpler, and the wire is more secure. Additionally, the frame ports are more hidden from the eye. The wiring follows the brake routing into the frame, so the port is hidden by the brake housing. This wiring path looks better and produces less drag.